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Ontology-Driven Software Development with Prot g and OWL

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Ontology-Driven Software Development with Prot g and OWL

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    1. Ontology-Driven Software Development with Protégé and OWL Holger Knublauch Stanford Medical Informatics holger@smi.stanford.edu Model-Driven Semantic Web Workshop 21.09.2004

    2. Protégé

    3. Protégé / OWL Plugin

    4. Protégé / OWL Plugin

    5. Overview How to develop Semantic Web applications? Example Architecture and OWL-Java mapping Tool support Can we apply this to general purpose MDA? OWL is often more suitable than UML Major benefit: Semantics at edit-time & run-time

    6. Example Scenario

    7. Traditional Web Architecture

    8. Semantic Web Architecture

    9. Ontologies

    10. Software Architecture (1)

    11. Ontology Code in Java

    12. UML to Java (conventional)

    13. OWL to Java (Jena)

    14. Working with Jena Classes

    15. Software Architecture (2)

    16. Dynamic Object Model Model is accessible at run-time: Generic algorithms/reasoners can be executed Generic test cases available at run-time Generic serialization, database storage etc. Generic user interfaces can be generated Classes can be handled as individuals (Metaclasses are supported) Instances can have multiple types (dynamic polymorphism using Jena API) Instances can be classified & change types

    17. Other OWL to Java Benefits Traditional Code: Code based on generated Jena classes:

    18. Generalizing This Approach Every program has a “domain model” Customers, Accounts, Products Patients, Diseases, Treatments Domain model is potentially most reusable No real need for UML Paradigm shift to a new dialect of OO

    19. Dynamic Object Models and MDA MDA taken to extremes Design not only to generate code Design is part of the deployed system Open ontologies to share between applications Machine-accessible semantics at run-time Built-in reflection across metalevels However: Limited expressivity of OWL; Coding needed (procedural attachment).

    20. Advantages of OWL over UML Explicit, sharable modeling artifacts Open architecture of Semantic Web OWL has rich semantics closer to domain than UML built-in reasoning support (DL, SWRL) A single language across metalevels

    21. Strengths of tools like Protégé Can be used by domain experts Better scalable than visual UML modeling Reasoning support at edit-time Rapid prototyping of models Individuals can be acquired using forms Open architecture / adaptability Start your application as a plugin

    22. Ontology-Driven Development

    23. Future Work with Protégé (1) Embrace UML, encourage use of OWL Incremental OWL-Java code generation Determine optimal mapping OWL to Java, (using an example application) Define rules for updating code in response to changes in the ontology (create, rename, etc). Write Eclipse plugin to perform the updating (either directly or in batch mode)

    24. Future Work with Protégé (2) Use Protégé as an ODM editor Map core Protégé metamodel to RDF(S) Collaborations?

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